I have a 2003 Hyundai Elantra. The remote locks the doors but sometimes it won't unlock the doors. I have to go to the passenger side, press lock on the remote, then press unlock (I can hear the 'clicks' for lock and unlock) and then use the key to open, climb through and unlock the driver's door. At one point it seem to help if I used the key and opened the trunk. The other doors will not unlock with the key. I replaced the remote batteries and even tried another remote. Same results. Happens intermittenly. Haven't figured out a pattern except seems to happen at worst possible times (dark parking lots late at night - not necessarily cold nights, when carrying lots of groceries or when I am in a hurry. Go figure - haha Thanks for your help.

Possible issue with the remote controller unit - main board or sub assemblies. The intermittent behavior seems to indicate that the board is erratic to detect at the same time the individual locks work at times.
So make sure all the connectors to the door and to the main board controller are tight. You can remove the main unit and check for any loose connections or clogging, specially water in all the door units or in main unit. If so dry and test.
Otherwise the main unit is a suspect.

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this is a problem that can appear after your car battery died, cause the car didn't reset propely, so taking the battery out and putting it back in or letting your car die again would do the trick. I tried a lot of reprogramming procedured for my remote key, none of them worked, what did the trick though was simply unlocking the doors via the all door unlock button on the passenger side door, so simple.

their is no doubt some way to reset it by turning the key so many times left and right ?? but try this ,and that put key in drivers side lock and lock and open three times slowly then open door on last attempt and try to start within 15 secs of opening the door lock ,also try the spare key in case the chip has fallen out of the key ??

I have just purchased a 2001 hyundia elantra, the other day i was filling up with petrol. the doors automatic lock the doors with my keys still inside the car, the doors make a clicking noice all the time

Door lock/unlock actuator (motor) has gone bad in the passenger side. Get the actuator from a Hyundai Parts dealer (or junk yard if you trust them) and replace it yourself OR take it to a Hyundai Service Center and they'll do it for you.